Module 7-9 Review

Which FHRP implementation is a nonproprietary protocol which relies on ICMP to provide IPv4 redundancy? IRDP GLBP for IPv6 GLBP VRRPv3

IRDP

Which FHRP implementation is a nonproprietary IPv4-only election protocol with limited scalability? VRRPv2 GLBP for IPv6 GLBP IRDP

VRRPv2

A company uses the SLAAC method to configure IPv6 addresses for the employee workstations. Which address will a client use as its default gateway?​ the all-routers multicast address the link-local address of the router interface that is attached to the network the unique local address of the router interface that is attached to the network the global unicast address of the router interface that is attached to the network

the link-local address of the router interface that is attached to the network

The address pool of a DHCP server is configured with 172.18.93.0/25. The network administrator reserves 10 IP addresses for web servers. How many IP addresses are left in the pool to be assigned to other hosts? 116 114 106 120 117

116

The address pool of a DHCP server is configured with 10.19.44.0/24. The network administrator reserves 3 IP addresses for servers. How many IP addresses are left in the pool to be assigned to other hosts? 251 249 241 255 252

251

A company uses DHCP to manage IP address deployment for employee workstations. The IT department deploys multiple DHCP servers in the data center and uses DHCP relay agents to facilitate the DHCP requests from workstations. Which two UDP ports are used to forward DHCP traffic? (Choose two.) 23 53 67 68 80

67 68

Which protocol automates assignment of IP addresses on a network, and which port number does it use? (Choose two.) DHCP DNS SMB 53 67 80

DHCP 67

A host PC is attempting to lease an address through DHCP. What message is sent by the server to let the client know it is able to use the provided IP information? DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK DHCPNACK

DHCPACK

A company uses DHCP servers to dynamically assign IPv4 addresses to employee workstations. The address lease duration is set as 5 days. An employee returns to the office after an absence of one week. When the employee boots the workstation, it sends a message to obtain an IP address. Which Layer 2 and Layer 3 destination addresses will the message contain? FF-FF-FF-FF-FF-FF and 255.255.255.255 both MAC and IPv4 addresses of the DHCP server MAC address of the DHCP server and 255.255.255.255 FF-FF-FF-FF-FF-FF and IPv4 address of the DHCP server

FF-FF-FF-FF-FF-FF and 255.255.255.255

Which FHRP implementation is a Cisco-proprietary protocol that suppports IPv4 load sharing? GLBP VRRPv3 GLBP for IPv6 VRRPv2

GLBP

Which FHRP implementation is a Cisco-proprietary protocol that suppports IPv6 load balancing? GLBP for IPv6 GLBP VRRPv3 IRDP

GLBP for IPv6

A network administrator is analyzing the features that are supported by different first-hop router redundancy protocols. Which statement describes a feature that is associated with HSRP? HSRP uses active and standby routers. It uses ICMP messages in order to assign the default gateway to hosts. It allows load balancing between a group of redundant routers. HSRP is nonproprietary.

HSRP uses active and standby routers.

What is an advantage of configuring a Cisco router as a relay agent? It will allow DHCPDISCOVER messages to pass without alteration. It can forward both broadcast and multicast messages on behalf of clients. It can provide relay services for multiple UDP services. It reduces the response time from a DHCP server.

It can provide relay services for multiple UDP services.

Which statement describes HSRP?​ If the virtual router master fails, one router is elected as the virtual router master with the other routers acting as backups. It is an open standard protocol. It uses ICMP to allow IPv4 hosts to locate routers that provide IPv4 connectivity to remote IP networks.​ It is used within a group of routers for selecting an active device and a standby device to provide gateway services to a LAN.

It is used within a group of routers for selecting an active device and a standby device to provide gateway services to a LAN.

A network administrator configures a router to send RA messages with M flag as 0 and O flag as 1. Which statement describes the effect of this configuration when a PC tries to configure its IPv6 address? It should contact a DHCPv6 server for all the information that it needs. It should use the information that is contained in the RA message exclusively. It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information. It should contact a DHCPv6 server for the prefix, the prefix-length information, and an interface ID that is both random and unique.

It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information.

A company uses the method SLAAC to configure IPv6 addresses for the workstations of the employees. A network administrator configured the IPv6 address on the LAN interface of the router. The interface status is UP. However, the workstations on the LAN segment did not obtain the correct prefix and prefix length. What else should be configured on the router that is attached to the LAN segment for the workstations to obtain the information?​ R1(config-if)# ipv6 enable R1(config)# ipv6 unicast-routing R1(config-if)# ipv6 nd other-config-flag R1(config)# ipv6 dhcp pool < name of the pool >

R1(config)# ipv6 unicast-routing

Which command will allow a network administrator to check the IP address that is assigned to a particular MAC address? Router# show ip dhcp binding Router# show ip dhcp pool Router# show ip dhcp server statistics Router# show running-config I section_dhcp

Router# show ip dhcp binding

A client device on an Ethernet segment needs an IP address in order to communicate on the network. A DHCP server with IP address 192.168.1.1 has been configured and enabled on the network. How will a client device obtain a usable IP address for this network? Send a DHCPREQUEST packet to IP address 255.255.255.255. Send a DHCPACK packet to the default gateway address. Send a DHCPDISCOVER message to physical address FF-FF-FF-FF-FF-FF. Use a statically configured IP address from the pool of IP addresses that is offered by the DHCP server.

Send a DHCPDISCOVER message to physical address FF-FF-FF-FF-FF-FF.

A small coffee shop is offering free Wi-Fi to customers. The network includes a wireless router and a DSL modem that is connected to the local phone company. What method is typically used to configure the connection to the phone company? Set the WAN connection in the wireless router as a DHCP client. Set the DSL modem as a DHCP client to get a public IP address from the wireless router. Set the connection between the wireless router and the DSL modem as a private IP network. Set the DSL modem as a DHCP client to the phone company and a DHCP server for the internal connection.

Set the WAN connection in the wireless router as a DHCP client

A small coffee shop is offering free Wi-Fi to customers. The network includes a wireless router and a DSL modem that is connected to the local phone company. What method is typically used to configure the connection to the phone company? Set the WAN connection in the wireless router as a DHCP client. Set the DSL modem as a DHCP client to get a public IP address from the wireless router. Set the connection between the wireless router and the DSL modem as a private IP network. Set the DSL modem as a DHCP client to the phone company and a DHCP server for the internal connection.

Set the WAN connection in the wireless router as a DHCP client.

What is the result of a network technician issuing the command ip dhcp excluded-address 10.0.15.1 10.0.15.15 on a Cisco router? The Cisco router will exclude 15 IP addresses from being leased to DHCP clients. The Cisco router will allow only the specified IP addresses to be leased to clients. The Cisco router will exclude only the 10.0.15.1 and 10.0.15.15 IP addresses from being leased to DHCP clients. The Cisco router will automatically create a DHCP pool using a /28 mask.

The Cisco router will exclude 15 IP addresses from being leased to DHCP clients

What is one indication that a Windows computer did not receive an IPv4 address from a DHCP server? The computer cannot ping 127.0.0.1. Windows displays a DHCP timeout message. The computer receives an IP address that starts with 169.254. The computer cannot ping other devices on the same network with IP addresses in the 169.254.0.0/16 range.

The computer receives an IP address that starts with 169.254.

After a host has generated an IPv6 address by using the DHCPv6 or SLAAC process, how does the host verify that the address is unique and therefore usable? The host sends an ICMPv6 echo request message to the DHCPv6 or SLAAC-learned address and if no reply is returned, the address is considered unique. The host sends an ICMPv6 neighbor solicitation message to the DHCP or SLAAC-learned address and if no neighbor advertisement is returned, the address is considered unique. The host checks the local neighbor cache for the learned address and if the address is not cached, it it considered unique. The host sends an ARP broadcast to the local link and if no hosts send a reply, the address is considered unique.

The host sends an ICMPv6 neighbor solicitation message to the DHCP or SLAAC-learned address and if no neighbor advertisement is returned, the address is considered unique.

Which statement is true about DHCP operation?​ If the client receives several DHCPOFFER messages from different servers, it sends a unicast DHCPREQUEST message to the server from which it chooses to obtain the IP information. A client must wait for lease expiration before it sends another DHCPREQUEST message.​ When a device that is configured to use DHCP boots, the client broadcasts a DHCPDISCOVER message to identify any available DHCP servers on the network.​ The DHCPDISCOVER message contains the IP address and subnet mask to be assigned, the IP address of the DNS server, and the IP address of the default gateway.​

When a device that is configured to use DHCP boots, the client broadcasts a DHCPDISCOVER message to identify any available DHCP servers on the network.​

What is a result when the DHCP servers are not operational in a network? Workstations are assigned with the IP address 0.0.0.0. Workstations are assigned with the IP address 127.0.0.1. Workstations are assigned with IP addresses in the 10.0.0.0/8 network. Workstations are assigned with IP addresses in the 169.254.0.0/16 network.

Workstations are assigned with IP addresses in the 169.254.0.0/16 network.

Which kind of message is sent by a DHCP client when its IP address lease has expired?​ a DHCPDISCOVER broadcast message a DHCPREQUEST broadcast message​ a DHCPREQUEST unicast message​ a DHCPDISCOVER unicast message​

a DHCPREQUEST unicast message​

Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server? unicast DHCPACK broadcast DHCPACK unicast DHCPREQUEST broadcast DHCPREQUEST

broadcast DHCPREQUEST

What is the reason that an ISP commonly assigns a DHCP address to a wireless router in a SOHO environment? better connectivity better network performance easy IP address management easy configuration on ISP firewall

easy IP address management

Which command, when issued in the interface configuration mode of a router, enables the interface to acquire an IPv4 address automatically from an ISP, when that link to the ISP is enabled? ip dhcp pool ip address dhcp service dhcp ip helper-address

ip address dhcp

What information can be verified through the show ip dhcp binding command? the number of IP addresses remaining in the DHCP pool the IPv4 addresses that have been excluded from the DHCPv4 pool that DHCPv4 discover messages are still being received by the DHCP server the IPv4 addresses that are assigned to hosts by the DHCP server

the IPv4 addresses that are assigned to hosts by the DHCP server

The address pool of a DHCP server is configured with 10.19.44.0/24. The network administrator reserves 6 IP addresses for servers. How many IP addresses are left in the pool to be assigned to other hosts? 248 246 238 252 249

248

Which message does an IPv4 host use to reply when it receives a DHCPOFFER message from a DHCP server? DHCPACK DHCPDISCOVER DHCPOFFER DHCPREQUEST

DHCPREQUEST